diff --git a/binding.c b/binding.c
index eadea27..778a13d 100644
--- a/binding.c
+++ b/binding.c
@@ -6,8 +6,21 @@
 
 typedef struct {
   js_context_t *context;
+  bool is_destroyed;
 } bare_realm_t;
 
+static void
+bare_realm__on_finalize (js_env_t *env, void *data, void *finalize_hint) {
+  bare_realm_t *realm = data;
+
+  if (realm->is_destroyed) return;
+
+  int err = js_destroy_context(env, realm->context);
+  assert(err == 0);
+
+  realm->is_destroyed = true;
+}
+
 static js_value_t *
 bare_realm_create (js_env_t *env, js_callback_info_t *info) {
   int err;
@@ -21,6 +34,11 @@ bare_realm_create (js_env_t *env, js_callback_info_t *info) {
   err = js_create_context(env, &realm->context);
   if (err < 0) return NULL;
 
+  realm->is_destroyed = false;
+
+  err = js_add_finalizer(env, handle, (void *) realm, bare_realm__on_finalize, NULL, NULL);
+  assert(err == 0);
+
   return handle;
 }
 
@@ -40,7 +58,7 @@ bare_realm_destroy (js_env_t *env, js_callback_info_t *info) {
   err = js_get_arraybuffer_info(env, argv[0], (void **) &realm, NULL);
   assert(err == 0);
 
-  js_destroy_context(env, realm->context);
+  bare_realm__on_finalize(env, realm, NULL);
 
   return NULL;
 }
diff --git a/test.js b/test.js
index 2b2d52c..42afe81 100644
--- a/test.js
+++ b/test.js
@@ -1,7 +1,7 @@
 const test = require('brittle')
 const Realm = require('.')
 
-test('basic', async (t) => {
+test('basic', (t) => {
   const realm = new Realm()
   t.teardown(() => realm.destroy())